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Refrigeration & Electrical Data
SELF CONTAINED
REMOTE
MODEL
404A
REFRIG.
VOLTAGE AMPERAGE
CORD
STYLE
VOLTAGE AMPERAGE
CORD
STYLE
LPRSS3
2 LBS
120/60/1
15
20AMP
NEMA 5-20
120/60/1
3
15AMP
NEMA 5-15
LPRSS4
3 LBS
120/60/1
15
20AMP
NEMA 5-20
120/60/1
3
15AMP
NEMA 5-15
LPRSS5
4 LBS
230/60/1
10
15AMP
NEMA 6-15
120/60/1
2
15AMP
NEMA 5-15
LPRSS6
4 LBS
230/60/1
12
15AMP
NEMA 6-15
120/60/1
2
15AMP
NEMA 5-15
Electronic Control Operation
This unit is equipped with an Invensys – Ranco temperature control. The control parameters are
set at the factory and cannot be manually changed in the field. Control parameter changes can
only be made by downloading a new set of parameters via a program chip supplied by Federal
Industries. The pre set control parameters are listed on the chart in the Settings Chart below.
Operation
The control uses two sensors, one located in the air stream and one located on the evaporator
coil. The sensor located in the air stream is referred to as the temperature control sensor. The
sensor located on the evaporator coil is referred to as the coil sensor.
The temperature control sensor is located inside the center tower at the top. The sensor location
is critical for proper operation on the unit. Do not move or relocate this sensor.
The coil sensor is strapped to the evaporator coil. This sensor location is critical for proper
operation of the unit. Do not move or relocate this sensor.
The temperature control is set to cut in at 38 degrees F. The Temp control cuts out at 16 degrees
F at the coldest setting’ COLD’ and 28 degrees F at the warmest setting, ‘1’ on the control dial.
The temp control turns off the refrigeration system when the control is turned all the way
counterclockwise.
Defrost Cycle
The Ranco control is programmed to initiate defrost via two different methods. There are 3
programmed defrost cycles in the case which will initiate a defrost cycle every 8 hours. The unit
does not have a time clock so the defrost cycles cannot be set for any specific time of day.
The unit also has an ‘On demand’ defrost feature that will initiate a defrost when the temperature
differential between the evaporator temperature and the air temperature is more than 12 degrees
for 5 minutes after 30 minutes into the refrigeration cycle. Once initiated the defrost cycle will
terminate when evaporator coil sensor reaches 45 degrees F.
